Models for Adding and Subtracting Fractions

Mr. Hobson is training for a triathlon. The model is shaded to represent the fraction of a mile that he completes in a practice session. How many miles does Mr. Hobson complete in all during his training session?

• 5/14 of a mile

• 5/8 of a mile

• 1 3/8 miles

• 1 1/8 miles

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

When adding or subtracting fractions, I NEVER add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

When adding or subtracting fractions, I always add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

Once I have completed adding or subtracting fractions, I should always ____________ if possible.

• make equivalent fractions

• add again

• simplify

• multiply

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

The shaded part of the model represents a fraction. Another fraction was subtracted from the first fraction. Which expression does the model represent?

Cara and Marcus shared a candy bar. The models are shared to show the fraction of the candy bar each of them ate. What fraction of the candy bar did Cara and Marcus eat altogether?

Mrs. Ali collected notebook paper from her students at the beginning of the school year. The model is shaded to show the fraction of this notebook paper that Mrs. Ali used in each of the three months. What fraction of the notebook paper Mrs. Ali collected was used during these three months?